1 /* 2 * Copyright (c) 1995, 1996 3 * Bill Paul <wpaul@ctr.columbia.edu>. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by Bill Paul. 16 * 4. Neither the name of the author nor the names of any co-contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 * 32 * $FreeBSD: src/usr.sbin/rpc.yppasswdd/yppasswdd_main.c,v 1.27 2008/10/30 01:54:31 rafan Exp $ 33 */ 34 35 #include <sys/param.h> 36 #include <sys/ioctl.h> 37 #include <sys/stat.h> 38 #include <sys/socket.h> 39 #include <sys/time.h> 40 #include <sys/resource.h> 41 #include <netinet/in.h> 42 43 #include <err.h> 44 #include <errno.h> 45 #include <fcntl.h> 46 #include <memory.h> 47 #include <signal.h> 48 #include <stdio.h> 49 #include <stdlib.h> /* getenv, exit */ 50 #include <string.h> /* strcmp */ 51 #include <syslog.h> 52 #include <unistd.h> 53 54 #include <rpc/rpc.h> 55 #include <rpc/rpc_com.h> 56 #include <rpc/pmap_clnt.h> /* for pmap_unset */ 57 #include <rpcsvc/yp.h> 58 #include <rpcsvc/ypclnt.h> 59 60 #include "yppasswd.h" 61 #include "yppasswdd_extern.h" 62 #include "yppasswd_private.h" 63 #include "ypxfr_extern.h" 64 #include "yp_extern.h" 65 66 #ifndef SIG_PF 67 #define SIG_PF void(*)(int) 68 #endif 69 70 #ifdef DEBUG 71 #define RPC_SVC_FG 72 #endif 73 74 #define _RPCSVC_CLOSEDOWN 120 75 int _rpcpmstart = 0; /* Started by a port monitor ? */ 76 static int _rpcfdtype; 77 /* Whether Stream or Datagram ? */ 78 /* States a server can be in wrt request */ 79 80 #define _IDLE 0 81 #define _SERVED 1 82 #define _SERVING 2 83 int debug; 84 85 static char _localhost[] = "localhost"; 86 static char _passwd_byname[] = "passwd.byname"; 87 extern int _rpcsvcstate; /* Set when a request is serviced */ 88 static char _progname[] = "rpc.yppasswdd"; 89 char *progname = _progname; 90 static char _yp_dir[] = _PATH_YP; 91 const char *yp_dir = _yp_dir; 92 static char _passfile_default[] = _PATH_YP "master.passwd"; 93 char *passfile_default = _passfile_default; 94 char *passfile; 95 char *yppasswd_domain = NULL; 96 int no_chsh = 0; 97 int no_chfn = 0; 98 int allow_additions = 0; 99 int multidomain = 0; 100 int verbose = 0; 101 int resvport = 1; 102 int inplace = 0; 103 char sockname[] = YP_SOCKNAME; 104 105 static void 106 terminate(int sig __unused) 107 { 108 rpcb_unset(YPPASSWDPROG, YPPASSWDVERS, NULL); 109 rpcb_unset(MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS, NULL); 110 unlink(sockname); 111 exit(0); 112 } 113 114 static void 115 reload(int sig __unused) 116 { 117 load_securenets(); 118 } 119 120 static void 121 closedown(int sig __unused) 122 { 123 if (_rpcsvcstate == _IDLE) { 124 extern fd_set svc_fdset; 125 static int size; 126 int i, openfd; 127 128 if (_rpcfdtype == SOCK_DGRAM) { 129 unlink(sockname); 130 exit(0); 131 } 132 if (size == 0) { 133 size = getdtablesize(); 134 } 135 for (i = 0, openfd = 0; i < size && openfd < 2; i++) 136 if (FD_ISSET(i, &svc_fdset)) 137 openfd++; 138 if (openfd <= 1) { 139 unlink(sockname); 140 exit(0); 141 } 142 } 143 if (_rpcsvcstate == _SERVED) 144 _rpcsvcstate = _IDLE; 145 146 signal(SIGALRM, (SIG_PF) closedown); 147 alarm(_RPCSVC_CLOSEDOWN/2); 148 } 149 150 static void 151 usage(void) 152 { 153 fprintf(stderr, "%s\n%s\n", 154 "usage: rpc.yppasswdd [-t master.passwd file] [-d domain] [-p path] [-s]", 155 " [-f] [-m] [-i] [-a] [-v] [-u] [-h]"); 156 exit(1); 157 } 158 159 int 160 main(int argc, char *argv[]) 161 { 162 struct rlimit rlim; 163 SVCXPRT *transp = NULL; 164 struct sockaddr_in saddr; 165 socklen_t asize = sizeof (saddr); 166 struct netconfig *nconf; 167 struct sigaction sa; 168 void *localhandle; 169 int ch; 170 char *mastername; 171 char myname[MAXHOSTNAMELEN + 2]; 172 int maxrec = RPC_MAXDATASIZE; 173 174 debug = 1; 175 176 while ((ch = getopt(argc, argv, "t:d:p:sfamuivh")) != -1) { 177 switch (ch) { 178 case 't': 179 passfile_default = optarg; 180 break; 181 case 'd': 182 yppasswd_domain = optarg; 183 break; 184 case 's': 185 no_chsh++; 186 break; 187 case 'f': 188 no_chfn++; 189 break; 190 case 'p': 191 yp_dir = optarg; 192 break; 193 case 'a': 194 allow_additions++; 195 break; 196 case 'm': 197 multidomain++; 198 break; 199 case 'i': 200 inplace++; 201 break; 202 case 'v': 203 verbose++; 204 break; 205 case 'u': 206 resvport = 0; 207 break; 208 default: 209 case 'h': 210 usage(); 211 break; 212 } 213 } 214 215 if (yppasswd_domain == NULL) { 216 if (yp_get_default_domain(&yppasswd_domain)) { 217 yp_error("no domain specified and system domain \ 218 name isn't set -- aborting"); 219 usage(); 220 } 221 } 222 223 load_securenets(); 224 225 if (getrpcport(_localhost, YPPROG, YPVERS, IPPROTO_UDP) <= 0) { 226 yp_error("no ypserv processes registered with local portmap"); 227 yp_error("this host is not an NIS server -- aborting"); 228 exit(1); 229 } 230 231 if ((mastername = ypxfr_get_master(yppasswd_domain, 232 _passwd_byname, _localhost, 0)) == NULL) { 233 yp_error("can't get name of NIS master server for domain %s", 234 yppasswd_domain); 235 exit(1); 236 } 237 238 if (gethostname((char *)&myname, sizeof(myname)) == -1) { 239 yp_error("can't get local hostname: %s", strerror(errno)); 240 exit(1); 241 } 242 243 if (strncasecmp(mastername, (char *)&myname, sizeof(myname))) { 244 yp_error("master of %s is %s, but we are %s", 245 "passwd.byname", mastername, myname); 246 yp_error("this host is not the NIS master server for \ 247 the %s domain -- aborting", yppasswd_domain); 248 exit(1); 249 } 250 251 debug = 0; 252 253 if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) { 254 socklen_t ssize = sizeof (int); 255 if (saddr.sin_family != AF_INET) 256 exit(1); 257 if (getsockopt(0, SOL_SOCKET, SO_TYPE, 258 (char *)&_rpcfdtype, &ssize) == -1) 259 exit(1); 260 _rpcpmstart = 1; 261 } 262 263 if (!debug && _rpcpmstart == 0) { 264 if (daemon(0,0)) { 265 err(1,"cannot fork"); 266 } 267 } 268 openlog("rpc.yppasswdd", LOG_PID, LOG_DAEMON); 269 memset(&sa, 0, sizeof(sa)); 270 sa.sa_flags = SA_NOCLDWAIT; 271 sigaction(SIGCHLD, &sa, NULL); 272 273 rpcb_unset(YPPASSWDPROG, YPPASSWDVERS, NULL); 274 rpcb_unset(MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS, NULL); 275 276 rpc_control(RPC_SVC_CONNMAXREC_SET, &maxrec); 277 278 if (svc_create(yppasswdprog_1, YPPASSWDPROG, YPPASSWDVERS, "netpath") == 0) { 279 yp_error("cannot create yppasswd service."); 280 exit(1); 281 } 282 if (svc_create(master_yppasswdprog_1, MASTER_YPPASSWDPROG, 283 MASTER_YPPASSWDVERS, "netpath") == 0) { 284 yp_error("cannot create master_yppasswd service."); 285 exit(1); 286 } 287 288 nconf = NULL; 289 localhandle = setnetconfig(); 290 while ((nconf = getnetconfig(localhandle)) != NULL) { 291 if (nconf->nc_protofmly != NULL && 292 strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) 293 break; 294 } 295 if (nconf == NULL) { 296 yp_error("getnetconfigent unix: %s", nc_sperror()); 297 exit(1); 298 } 299 unlink(sockname); 300 transp = svcunix_create(RPC_ANYSOCK, 0, 0, sockname); 301 if (transp == NULL) { 302 yp_error("cannot create AF_LOCAL service."); 303 exit(1); 304 } 305 if (!svc_reg(transp, MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS, 306 master_yppasswdprog_1, nconf)) { 307 yp_error("unable to register (MASTER_YPPASSWDPROG, \ 308 MASTER_YPPASSWDVERS, unix)."); 309 exit(1); 310 } 311 endnetconfig(localhandle); 312 313 /* Only root may connect() to the AF_UNIX link. */ 314 if (chmod(sockname, 0)) 315 err(1, "chmod of %s failed", sockname); 316 317 if (transp == NULL) { 318 yp_error("could not create a handle"); 319 exit(1); 320 } 321 if (_rpcpmstart) { 322 signal(SIGALRM, (SIG_PF) closedown); 323 alarm(_RPCSVC_CLOSEDOWN/2); 324 } 325 326 /* Unlimited resource limits. */ 327 rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY; 328 setrlimit(RLIMIT_CPU, &rlim); 329 setrlimit(RLIMIT_FSIZE, &rlim); 330 setrlimit(RLIMIT_STACK, &rlim); 331 setrlimit(RLIMIT_DATA, &rlim); 332 setrlimit(RLIMIT_RSS, &rlim); 333 334 /* Don't drop core (not really necessary, but GP's). */ 335 rlim.rlim_cur = rlim.rlim_max = 0; 336 setrlimit(RLIMIT_CORE, &rlim); 337 338 /* Turn off signals. */ 339 signal(SIGALRM, SIG_IGN); 340 signal(SIGHUP, (SIG_PF) reload); 341 signal(SIGINT, SIG_IGN); 342 signal(SIGPIPE, SIG_IGN); 343 signal(SIGQUIT, SIG_IGN); 344 signal(SIGTERM, (SIG_PF) terminate); 345 346 svc_run(); 347 yp_error("svc_run returned"); 348 exit(1); 349 /* NOTREACHED */ 350 } 351